Storing Class-A Chemicals Underground: Is It Required by the Petroleum Act?

I observed that all Class-A chemicals whose flash point is less than 23 degrees are being stored in underground storage tanks. Is it mentioned in the Petroleum Act/Rules to store them underground? If so, what is the section/rule number?

If anyone has prepared important provisions on the Petroleum Act & Rules, Gas Cylinder Rules, Static Mobile Pressure Vessels, please share.

Regards

Petroleum Storage Regulations

As per the Petroleum Rules of 2001, Rule Number 122 states that petroleum should only be stored. No installation, service station, or storage shed shall be used for any purpose other than the storage and distribution of petroleum without written permission from the Chief Controller. These facilities should only be used for purposes directly connected to petroleum storage and distribution.

Layout Plan Requirements Under the Petroleum Act

As per Section 10.1 of the Petroleum Acts and the rules framed thereunder regarding the layout plan:

The layout of the premises should show the plan view of the installation. This must indicate the road with its directions and the inter-distances among various facilities of the installation, such as underground tanks, above-ground tanks, and enclosure walls in the case of above-ground tanks. It should also include barrel filling facilities, petroleum storage godowns in non-bulk, tank lorry platforms, fill point(s), and boundary wall/fencing within the premises. The layout plan must show the dimensions of the premises, ingress and egress, buffer islands, pipelines, etc.